Tim has read 80% of a book. He has 18 more pages to finish. How many
pages are there in the book?
0.20x = 18
x = 90
To find the total number of pages in the book, we can first calculate how many pages Tim has already read. We know that Tim has read 80% of the book, so we can represent that as a decimal: 80% = 0.8.
Next, we can calculate the number of pages Tim has read by multiplying the percentage (0.8) by the total number of pages in the book:
Pages Tim has read = 0.8 * Total number of pages
Since we want to find the total number of pages, we can solve this equation for the total number of pages:
0.8 * Total number of pages = Pages Tim has read
Now we have all the information we need to solve the problem. We know that Tim has read 18 pages (Pages Tim has read = 18), so we can substitute that value into our equation:
0.8 * Total number of pages = 18
To isolate the variable (Total number of pages), we can divide both sides of the equation by 0.8:
Total number of pages = 18 / 0.8
Now we can solve for the total number of pages:
Total number of pages = 22.5
However, since the number of pages in a book must be a whole number, we round up to the nearest whole number:
Total number of pages = 23
Therefore, there are 23 pages in the book.